I have been working on Jandy systems for about 10 years. I have changed over a 100 code 170 and only a few ended up being anything more than the trisensor. The new sensor only has 2 contacts instead of 3. Im talking about the part that goes in the cell. The silver ones. Make sure you get one of the new ones or you may end up having the same problem again soon. I know some Jandy reps that know a lot more than me but I have been doing Jandy Warranty repairs for over 10 years in the New Orleans area. Not telling you this to brag. Just wanted to let you know my experience. Code 170- Code 172- and no flow showing on remote are all sensor problems. When you look at the contacts you may see some rust. If you do this almost always gives Code 170.
I have a question ConradM,
I'm troubleshooting my PLC1400 and i'm hoping it's the sensor like you are stating with the Error Code 170. I unplugged the flow sensor and everything goes back to normal almost. Front panel shows 0% chlorine(i just filled up the pool with new water recently) but lights up Cell Reversing indicator and Code JO with "Wait". As far as Voltage Testing goes.
Below are readings with Flow Sensor Unplugged:
Transformer Voltage = 79.5vAC Points 1 & 8
Back Board Test Point
1 & 8 = 79.5vAC
2 & 7 = 69.0vAC
3 & 6 = 21.6vAC
4 & 5 = No Reading 0 (This is the one that should read 120MvDC with Cell On)
DC Voltage out from board to salt cell connector = No reading for vDC (supposed to be 22-28vDC)
Front Board Troubleshoot
Current Test on Front Board (with flow sensor unplugged "Cell Reversing Light came on" but not Cell On Light)
Test Points K to H = No reading (This is also MvDC)
Test Points A & C - 21vAC
Hold Salinity + R-Temp Button and Salinity Button on Front Board = 2.8GPL (Okay per Manual)
Hold Salinity + R-Temp Button and Pool Temperature Button on Front Board = 74 DegreeF
Press and Hold H- Temp + Press Salinity Button + Chlorine Production button = unsure will test tomorrow.
Above was tested with the flow sensor unplugged.
when the flow sensor is plugged in everything is the same for all the vAC(same as above) & vDC(still showing no reading or 0vDC from Backboard to Cell and also 0vDC from point K and H on front board)
my question i guess would be that if the sensor was bad. would that cause it not to send out DC voltage the the plug that connects the cell? if not could it be the back board and if so does anyone have a part number?
thank you for all your help as i'm a newbie